I can’t seem to figure out how to get the right value for my integral. I’m not getting an error and when I test the separate elements of my function it seems to give me back all the right values but when I put it all together it gives me a bad result.

So far this is what I have

def trap_rule(y_values, x_values):
    delta = (x_values[-1] - x_values[0])/(len(x_values))
    int_ = 0.0
    for i in range(0, len(y_values)):
        int_ += (y_values[i-1] + y_values[i]) / 2
        int_ = int_ * delta
        
    return int_

mydata_sund= pd.read_csv("sund1.csv")
sund_time = list(mydata_sund["time [hr]"])
sund_power = list(mydata_sund["power [kW]"])

intergral = trap_rule(sund_power, sund_time)

The output I get is 3.5005 which I incorrect… I think
It does give me two lists with the right data in it so I’m 90% sure it’s not a problem with importing the files.
And when I calculate my delta_x for my function it also returns the correct value

I have been trying to find answers on here, but I can’t seem to find anything related to using a list and not just having the values already given.

Sorry In advance if this is formatted wrong, this is my first time using StackOverflow